Industrial 0631104AC In-Duct Smoke Sensor Module

0631104AC In-Duct Smoke Sensor Module is the sensing element designed for installation inside Autocall TrueAlarm duct detector housings to monitor smoke in HVAC ductwork. Leveraging TrueAlarm photoelectric sensing, this module detects smoke within the sampled airstream and triggers the duct detector assembly’s alarm output to the building fire alarm system. It is intended for commercial and industrial HVAC installations and is used in conjunction with detector housings that sample air via duct tubes sized to the duct width; the assembly supports combinations for rectangular and round ductwork depending on the housing model. The 0631104AC is identified as the internal sensor module within the duct detector hardware, and it pairs with the TrueAlarm electronics to provide localized smoke detection without relying on open-area detectors. In typical installations, the duct housing includes an exhaust or sampling tube and a test/maintenance interface, allowing technicians to perform functional checks while the cover remains in place. This module is part of Autocall’s TrueAlarm line, which emphasizes reliable smoke sensing in confined duct paths and seamless integration with conventional fire alarm systems through the detector housing and control panel interface.